Michael Marcus discussed causes of financial disablement in Market Wizards: Interviews with Top Traders.

I think the leading cause of financial disablement is the belief that you can rely on the experts to help you. It might, if you know the right expert….Typically, however, these so-called “experts” are not traders. Your average broker couldn’t be a trader in a million years. More money is lost listening to brokers than any other way. Trading requires an intense personal involvement. You have to do your own homework, and that is what I advise people to do.